HomeMy WebLinkAboutObservation of Excavation 06.28.20221f+A Geotedmical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumamsa.com
An Employee Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 28, 2022
Hayes Construction
Attn: Chris Hayes
214 8"' Street, Suite 300
Glenwood Springs, Colorado 81601
chris ,hayesaspen.com
Project No. 21-7-123.A
Subject: Observation of Excavation, Proposed Davis Residence, Lot H-21, Aspen Glen,
75 Horseshoe Lane, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on June 28, 2022 to evaluate the soils exposed for foundation support. The findings
of our observations and recommendations for the foundation design are presented in this report.
We previously conducted a subsoil study for design of foundations at the site and presented our
findings in a report dated February 11, 2021, Project No. 21-7-123.
The proposed residence will be one and two story wood frame construction above a partial
basement and partial crawlspace with an attached garage. Basement and garage floors will be
slab -on -grade. Spread footings placed on the natural soils and sized for the recommended
allowable bearing pressure of 1500 psf with a risk of settlement were designed for the foundation
support.
At the time of our visit to the site, the foundation excavation had been cut in two levels from 5 to
9 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of sandy silty clay. No free water was encountered in the excavation and the soils were
slightly moist to moist.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and suitable for support of spread footings designed for the recommended allowable
bearing pressure of 1,500 psf with a risk of movement if the bearing soils are wetted. Loose
disturbed soils in the footing areas should be removed and the exposed soils moistened and
compacted. Other recommendations presented in our previous report which are applicable,
especially those to keep the bearing soils dry, should also be observed.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation and the previous subsurface exploration at the site. Variations
in the subsurface conditions below the excavation could increase the risk of foundation
movement. We should be advised of any variations encountered in the excavation conditions for
possible changes to recommendations contained in this letter. Our services do not include
Hayes Construction
June 28, 2022
Page 2
determining the presence, prevention or possibility of mold or other biological contaminants
(MOBC) developing in the future. If the client is concerned about MOBC, then a professional in
this special field of practice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
e;�
Louis Eller
Reviewed by:
Steven L. Pawla
LEE/kac
Kumar & Associates, Inc. �Project No. 21-7-123.A